The story takes place on the high seas. According to legend, there is a prehistoric behemoth living on the bottom of the high seas, guarding a huge treasure worth a fortune. The news that spread quickly attracted the attention of countries around the world. The United States, Japan and other countries also sent agents to investigate and visit secretly, hoping to get the treasure first. Charles (Peter Stormare) is a senior American spy. He is ambitious and will do anything to achieve his goals. Seeing that agents from other countries are getting closer and closer to the treasure, Charles decides to illegally hire a criminal group to work for him. Just as the battle for the treasure became increasingly fierce, the deep-sea behemoth that had been sending signals disappeared overnight. Coast guard Lin Hai (Zhang Xu) noticed the illegal actions going on on the sea, and he led his team members to start a desperate battle with the criminals.